A cantilever , low-wing, all-metal aircraft, the G.12 had beautiful fuselage lines and high vertical tail. The aircraft was equipped with a retractable tailwheel landing gear and thrust was provided by three Fiat radial engines. The capacity of the civilian variants was designed for 14 passengers. Ordered for passenger transport, the Fiat G.12C, delivered since 1941, went directly to the military organization that coordinated the remaining civilian air transport.

The G.12 "Gondar" was a special long-range variant designed to operate on links with Italian East Africa. It was followed by three G.12 GA transport aircraft, also equipped with additional fuel tanks. At the end of 1942 and the beginning of 1943. were built one copy of the model G.12 RT and G.12 RTbis, intended for flights between Rome and Tokyo. The first had a range of 8000 km, the second - 9000 km.

The main military option was the G.12T aircraft. Its tasks included the implementation of regular transport services between Italy and North Africa, where the long range of the G.12 was especially useful. These aircraft turned out to be simply irreplaceable in the evacuation of Italian troops from Tunisia, but if the previous year and a half the transport workers flew off almost without losses, then by the spring of 1943 the situation had changed dramatically, not for the better for Italy.

Established in the fall of 1942, the air bridge between Italy and North Africa collapsed before our very eyes. The most difficult days for the transport aviation of the Axis countries began in March 1943. So, on April 5, during a series of B-17 raids, 14 transport aircraft burned down at the airfields of Palermo and Trapani. On the same day, 11 SM.82 and 5 Fiat G.12, barely having time to arrive at the Tunisian airfield of El Aouin, came under bombs from 20 American B-24 bombers. On the airfield, two Savoyes and three Fiats were immediately destroyed. Another 12 German aircraft were also damaged, 8 of which could not be repaired. April 19 was a "doomsday" for the G.12 - after taking off from an Italian airfield, a mixed group of one SM.75 and 12 SM.82 and G.12 never managed to reach the Tunisian coast, losing all aircraft on the way to it. The second group of 18 Italian and German transport aircraft tried to cover 12 MS.200 and MS.202, but here, too, luck turned away from them. During the battle with allied fighters, 7 more planes were shot down. The heavily thinned Italian transport aviation could not bear such losses, although flights to Africa continued until May 1943, when the situation of the troops remaining there was hopeless.
With the division of Italy in September 1943 into two states, the G.12s continued to serve both sides, and after the war, the surviving G.12s were used by the Italian Air Force as courier transport.
Production was soon resumed, and the last version built was the G.12CA, a civil airliner powered by Alfa Romeo 128 RC.18 engines with a capacity of 850 hp each. with. and the G.12L model with an elongated fuselage, accommodating 18 passengers and equipped with 870 hp Fiat A.74 RC.42 engines. with. ... The G.12LP was powered by Pratt & Whitney R-1830-S1C3-G engines, while the G.12LB was powered by Bristol "Pegasus" 48 engines.
On May 5, 1947, the first aircraft of the airline Alitalia, G.12, took to the skies, which flew from the Italian city of Turin to Rome, the next was a flight from Rome to Catania.
By the time production was completed in 1949, a total of 104 aircraft of all variants had been built.
Type 4 seat + 14 troops or 24 civilian  transport
Engine 3 Fiat A.74 R.C.42 with 3-bladed constant speed propellers
Dimensions Length 20,1 m , height 4,9 m ,  span 28,6 m , wing area  113 m2 ,
Weights Empty 9420 kg, loaded 15000 kg , max. take off weight  
Performance Max.. speed 390 km/h at 5000 m , cruising speed 303 km/h , range 2300 km, endurance  , service ceiling  8500 m , climb
Armament 2 MG 151